Means for tamping bore-holes charged with blasting compounds.



1 821 891 Patented Mar, 6! i912.

Y (i 'Wa 7711/611 heron .WILHELM WEBER, F HAYINGEN, GERMANY.

MEANS FOR TAMPING BORE-HOLES CHARGED WITH BLASTING COMPOUNDS.

Speciflcatio'n of Letters Patent.

\ Application filed October 1, 1915. Serial No. 58,480.

To all whom it may cancem:

.Be it known that l, WILHELM Wanna, a

subject of the German Emperor, residing at ing Compounds, of which the following is a specification.

This invention relates to means for tamp- 7 ing. bore-holes charged with a blasting compound, and more particularly to means for tamping blasting charges which are based on the action of liquid air.

In another application for a patent I have I described blasting cartridges consisting of a combustible metallic powder, an absorptive substance for liquid air, and v a prlmer. These compounds may either be introduced directly into a chamberdike enlargement of the bore-hole, whereafter the liquid. air is added by ourin same into'the absorptive mass; or t e blas ing charge is placed into a cartridge and saturated with liquid air I either prior to or after, introductionof the cartridge into the bore-hole, which for the receptionof the cartrid e need not be provided witha chamber-lite enlargement. In either case the tamping is put on at last. 011 contact of the saturated absorbent, or the saturated blasting cartridge, with the walls of the bore-hole a portion of the li uid air quickly evaporates on account of the cat received from the walls of the bore-hole, and the vapors developing may produce the result that the tamping is expelled from the bore-hole. the tamping it has been a usual practice hitherto to leave a, small passage in the 'tampin through which the vapors could escape. owever, it may occur that the passage provided for the escape of the vapors is either insufiicient to permit all vapors to escape, or else, it is made too large so that the necessary explosive efiect will not be obtained.

It is the object of my present invention to i provide improved means for tamping boreholes which improved means are adapted to permitthe vapors of'the liquid air to escape during the action of putting the tamping on but successfully prevent an expulsion of the tamping should an increased pressure he produced within the blasting charge.

tamping the bore-hole I first place the usual tamping material looselyon top of the blasting charge, or the blasting cartridge, .thus

To avoid such an expulsion of.

allowing the vapors to escape througthe space left between the cartridge, and the tamping on the one hand and the wall of the bore-hole on the other. Upon the tamping I place a stopper provided with novel means Patented liter. 6, 1931 t.

for locking same within the bore-hole; the

prepared within a-bore-hole. In. the draw-- i-ngs Figure 1 represents a longitudinal section through a bore-hole with the novel tamping in plaw, and Fig. 2 is a cross section taken on the line A.B in Fig. 1.

Referring to the drawings, (1 represents a bore-hole, b a blasting charge therein, 0 tamping material placed on top of the blasting charge, and d a. stopper made of any suitable material and provided with plate springs of steel, the plate springs having their en s bent outwardly toward the mouth of the borehole, so as to engage the wail of the borehole. At d the stopper is shown in dotted lines at the mouth or the borehole while being passed down the latter. 'The wires leading to the primer for setting the charge are indicated at e. lihe stopper is of a smaller diameter than the bore-hole, while the length of each spring 9 exceeds the diameter of the bore-hole. One plate spring g may be used, or a plurality of same. When using two springs 1 prefer to dispose them crosswise as shown, and to fasten them on the stopper bymeans of a screw. Other suitable fastening means may be employed. As will be seen on reference to the drawings the ends of the springs have become bent round somewhat. toward the mouth o'r" the bore-hole; thus, when throngh liquid air evaporatinga pressurejsp duced that acts on the stopper (5 the ends of the springs become engaged with-the wall of the borehole in such a way as to lock the stopper (5 rind to prevent an expulsion of the stopper; I Wish it to be understood that my inventicn is not limited to the special constructions shown in the drawings; various modi fications may be made without departing smaller diameter than the bore-hole to form a clearanre thercbetween, a plateispring on "and plate springs on said stopper, each of whidli plate springs exceeding in length the dianieter of the borehole.

3. The combination with a tamping material for tamping bore-holes, of'a stopper of smaller diameter than the bore-hole to form a clearance therebetween, said stopper being adapted to be placed on top of the tamping material, and plate springs exceeding in e said springs being fastened to said stopper so as to become bent round at their ends ngth the diameter of the borehole/ff while said stopper is being inserted into the bore-hole.

4. The combination of a blasting charge with tamping material placed on top of said blasting charge, a stopper placed on top of said tainping material, and plate springs on said stopper having their ends bent toward the mouth of the bore-hole and engaging the wall of the bore-hole so as to talnping from being expelled.

5. In combination, a lasting charge containing liquid air, a tamping of smaller diameter than the borehole, a sto per adapted to fit loosely into the bore-ho e to form a prevent the clea am-e therebetween, and plate springs on said stopper, said plate springs being adapted to engage the wall on the borehole so as to offer resistance against an expelling force acting oir said stopper rom within said blasting eharge;

\VILHELM WEBER.

Witnesses:

- I J. D. ZmsECKn,

'YGIYENNIE ()BERGETIIMANN. 

